物理学报Issue(11)：1-9,9.DOI:10.7498/aps.64.110702
椭偏精确测定透明衬底上吸收薄膜的厚度及光学常数
Accurate determination of thickness values and optical constants of absorbing thin films on opaque substrates with sp ectroscopic ellipsometry
李江 1唐敬友 2裴旺 3魏贤华 1黄峰3
作者信息
- 1. 中国科学院海洋新材料与应用技术重点实验室，浙江省海洋材料与防护技术重点实验室，中国科学院宁波材料技术与工程研究所，宁波 315201
- 2. 西南科技大学材料科学与工程学院，绵阳 621010
- 3. 西南科技大学材料科学与工程学院，绵阳 621010
- 折叠
摘要
Abstract
The determination of the optical constants of absorbing films, particularly on opaque substrates, is a difficult problem when solely using spectroscopic ellipsometry. First, unwanted backside reflections are incoherent with the desired reflection from the front side, which makes the fitting of optical constants difficult. Second, the optical constants of substrate must be carefully characterized in advance, as any small absorption in the substrate would be mixed into the film’s overall optical constants. Third, thickness and optical constants are strongly correlated with each other, which may prevent a unique solution for absorbing films. For the above reasons, quartz, glass slide, cover glass and float glass substrates are studied. Backside reflections of the substrates are suppressed by index matching technique. The results show that the simple technique works well for substrate materials with refractive index in a range from 1.43 to 1.64, including materials such as fused silica, float glass, etc. in a spectral range from 190 nm to 1700 nm. The refractive index and extinction coefficient of the substrate are fitted by ellipsometricψdata and the normal spectral transmittance T0. The results are consistent with the literature reported. Finally, a Combined ellipsometry and transmission approach is used to determine the thickness values and optical constants of the diamond-like carbon (DLC) film coated on the quartz and the amorphous silicon (a-Si) film coated on the glass slide and cover glass accurately.关键词
背反/折射率匹配/吸收薄膜/光学常数Key words
backside reflections/index matching techniques/absorbing films/optical constants引用本文复制引用
李江,唐敬友,裴旺,魏贤华,黄峰..椭偏精确测定透明衬底上吸收薄膜的厚度及光学常数[J].物理学报,2015,(11):1-9,9.
